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тАО09-02-2009 02:19 AM
тАО09-02-2009 02:19 AM
Can I use a common NTP server from multiple VLANs ?
I have multiple VLANs on my static network which is primarily using 2824 switches.
Only one VLAN has configured IP addresses, and this is used for management. This way, the other VLANs are isolated, and the network does not care what IP address space is used in the various VLANs. They are being used for static purposes such as video, telemetry, dedicated point-to-point connections etc.
One of the applications must now use and NTP server, which is going to be a GPS box, which is easily attached.
But I was thinking that maybe I could use this reasonably exact time for the management VLAN also, and perhaps other uses in the future.
So now I have to think about routing for the first time.
Is there a way that I can reach the single IP address of the NTP server from multiple VLANs *without allowing the VLANs to see each other* ?
This is what I think I should do:
- Enable routing in one switch
- Optionally put the NTP server in its own VLAN
- Set the routing switch as default gateway in all switches that need to reach the NTP server
- Set a static route in the routing switch pointing to the NTP server
- Set static routes in the routing switch pointing back to the NTP users, so the NTP server can respond
- Ummm ...
Am I even close here?
I am guessing the static routes are so specific that general cross-VLAN access.
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тАО09-02-2009 03:05 AM
тАО09-02-2009 03:05 AM
Re: Can I use a common NTP server from multiple VLANs ?
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тАО09-02-2009 04:01 PM
тАО09-02-2009 04:01 PM
Re: Can I use a common NTP server from multiple VLANs ?
Multinet the NTP server. Does the server NIC support tagging?
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тАО09-02-2009 11:14 PM
тАО09-02-2009 11:14 PM
Re: Can I use a common NTP server from multiple VLANs ?
if clients have no default gateway configured or point to another address then the switch you configured these clients will not be able to access the other vlan's.
It' not realy secure, but will block accidental acces to other vlan's.
beware if you configure a vlan for "management only" then it will not route!
the switch will route between other vlans but not from/to the management vlan.
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тАО09-03-2009 10:37 PM
тАО09-03-2009 10:37 PM
Re: Can I use a common NTP server from multiple VLANs ?
This setup is very convenient for me and my users.
Configuring the default gateway only on the devices that must access the NTP server is a good idea. As you say, it's not really secure, but good enough for me, as my network is static, and mostly used for video, telemetry and various "transportation" point-to-point connections.
Thanks for tip with the "management only" VLAN. I didn't know that, and I have wondered what the setting was for. It's not enabled and now it's not going to be.
For now, it looks like I'm going with a 2910 switch and ACLs.